rails/rails — pull request #18097 by k0kubun (2014-12-19 16:08:14+00:00)
Title: `eager_load` preserves readonly flag for associations

Closes #15853

I changed `join_dependency` to pass test in 5706d290b0a2501a713fadfb76d9e45c24d26e6a.
@senny Please check this PR.